TWI468155B - Electric wheelchair - Google Patents

Description

electric wheelchair

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to an electric wheelchair, and more particularly to an electric wheelchair having a stair climbing function and capable of safely and smoothly moving up and down a plurality of stairs, up and down slopes, or climbing obstacles.

Wheelchairs for people with reduced mobility are designed in a variety of ways, some of which are designed to climb ladders. In this type of design, most of the complex wheels, mobile track and wheel combinations, or other devices are used. Electronic induction, hydraulic booms, etc., result in high cost, and some of these designs have serious safety problems, or they are bulky, very inconvenient to use, and some require assistance from others when going up and down stairs.

Chinese Utility Model Patent No. 201079509Y discloses a crawler climbing chair, which comprises a seat, a seat bracket, a wheel and a crawler running mechanism disposed under the seat bracket, and an automatic balancing mechanism disposed under the seat, wherein the crawler walking The mechanism is driven by an electric drive unit, and the crawler section includes an upper track and a lower track, and the rear side of the lower track is at an angle to the ground. Although the crawler chair uses an automatic balancing mechanism to keep the seat balanced, it is designed to ignore the fulcrum and force point lever problems and the seat is not equipped with an automatic locking mechanism, so that when going up or down the stairs Because the center of gravity line is too close to the fulcrum, if the passenger leans forward slightly, the climbing chair tends to lean forward and may cause a risk of rollover. In addition, since the crawler position cannot be adjusted, the stair chair may be tripped when it encounters an obstacle on the ground.

China Utility Model Patent No. 201316363Y discloses a wing-shaped ladder truck using a wheel and a crawler traveling mechanism, which adopts a combination of a reducer and a DC motor to realize continuous ascending ascending, and the crawler portion includes a running crawler, a climbing crawler and an auxiliary crawler, wherein climbing The track is arranged on both sides of the front end of the frame of the ladder truck, and can be controlled to rotate and retract within a certain angle range; the auxiliary track is arranged on both sides of the rear end of the frame, and can also be controlled to rotate and retract within a certain angle range. Although the ladder truck of this design can run smoothly when going up or down the stairs, but because the bottom design is flat, when driving to the level of the ground, especially the top of the ladder, the body will suddenly fall rapidly, which may impact passengers. Constitute danger. Even if there are front and rear auxiliary tracks, it is difficult for passengers to take care of both the front and rear tracks and the direction of front and rear travel. Moreover, the ladder truck of this design has a large shape and is extremely inconvenient in operation and operation.

When the wheelchair climbs up the ladder, the above-mentioned or other electric wheelchair products use the mobile seat to solve the problem of the seat tilt because the body is tilted sharply, but most of them ignore the lever problem of the fulcrum and the force point, thinking that as long as The seat movement can solve the problem, and even did not think about locking the seat, there are certain concerns about safety.

When the crawler-type wheelchair climbs to the top of the ladder, the body will suddenly fall due to the center of gravity problem, which may cause impact and danger to the passenger. Therefore, some products use some complicated mechanical devices to solve this problem, which greatly increases the cost.

There are also some products that are complicated in design, resulting in a relatively large volume, which is inconvenient whether it is driving on the ground or going up and down stairs.

In order to at least partially solve some of the problems associated with prior art electric wheelchairs, the present invention provides an electric wheelchair that has the following advantages:

- The roller seat wheel is provided on both sides of the bottom of the mobile seat of the electric wheelchair of the present invention, and the weight of the passenger is supported on the vehicle body evenly, so that the seat moves more smoothly and safely;

- With anti-reverse gear combination and safety lock device, in addition to double safety for passengers, the seat can be more flexible and practical, and it is convenient for passengers to get on and off the wheelchair and other daily life;

- With an extended stretch track, the distance between the pivot point of the wheelchair and the center of gravity line can be increased, thereby increasing safety when stepping up and down the stairs;

- The active extension track can be rotated 360 degrees and can be stored on both sides of the body, reducing the size of the wheelchair and allowing safe passage when encountering obstacles;

- Two-stage underbody design that allows the wheelchair to operate smoothly and smoothly, regardless of the steps up and down;

- The active extension track is equipped with anti-reverse gears and safety locks to ensure that the track is locked in the desired position, which greatly enhances safety;

- With a compact seat balance sensor, it is simple in structure and takes up very little space.

The above objects and advantages of the present invention can be achieved by the following features.

The electric wheelchair of the present invention includes a movable seat portion serving as a body portion of the seat frame, a seat adjustment mechanism disposed under the seat for maintaining the balance of the seat portion, and a vehicle located below the body portion a bottom portion, and a crawler running mechanism, the crawler running mechanism comprising two sets of crawlers respectively disposed below the two sides of the underbody portion, each set of the crawler includes a front crawler and a rear crawler.

The bottom portion of the vehicle is composed of two front and rear portions, and the front and rear portions are movably connected by a connecting device and are mutually deflectable relative to each other within a certain angular range.

The crawler running mechanism further includes an active extending crawler belt respectively disposed outside each of the front crawler belts, and a pulley at one end of the movable extending crawler belt is fixedly connected with a pulley of a front end of the front crawler belt, and the free end of the movable extending crawler belt passes The control lever is rotatable in a forward or reverse direction with respect to its fixed end within a range of 360 degrees, and a fixed upper ladder track respectively disposed outside each of the rear crawlers, the pulley at one end of the fixed upper crawler track and the rear end of the rear crawler belt The pulley is fixedly coupled and the free end of the fixed upper ladder track is offset from the rear track by a certain angle.

The seat adjustment mechanism and the active extension track are each driven by a separate geared motor, each set of tracks of the track travel mechanism being driven by a separate electric motor.

a bottom of each of the movable seat portions is provided with a set of roller wheels, the seat portions are supported on the body portion by the roller wheels, and each group of the roller wheels is controlled by The device is controlled to move along a sliding path formed on the body portion.

A control device for controlling the roller wheel includes a control lever electrically connected to a reduction motor of the seat adjustment mechanism and a safety lock device disposed on the body portion.

The safety lock device is a two-wing safety lock device comprising a housing, a pair of spring-loaded locking members fixed to the wall of the housing, two pinions, one of which is configured to be small a motor, each of the locking members having a small toothed edge and a large toothed edge, the two pinion gears respectively meshing with the small toothed edges of one of the locking members, and the large toothed edges of the two locking members Engaging with the teeth of the arc-shaped bottom edge of the longitudinal plate of the seat portion when the safety lock device is in the locked state, and the large tooth edge of the locking member is in the pinion gear when in the unlocked state The teeth that move away from the arc-shaped bottom edge of the longitudinal plate are driven and locked in their initial positions by respective springs.

The reduction motor for driving the seat adjustment mechanism includes an anti-reverse helical gear.

The seat adjustment mechanism includes a balance sensing device including a weight serving as a pendulum and a bracket portion for supporting and allowing the weight to swing, the bracket portion being configured with an electrical circuit, The electrical circuit is electrically coupled to the geared motor for the seat adjustment mechanism and to the storage battery.

The geared motor for driving the active extended crawler includes an anti-reverse helical gear and a double-wing safety lock device.

The seat portion is coupled to a large gear in the reduction motor for driving the seat adjustment mechanism through a connecting member.

1 shows a perspective view of one embodiment of an electric wheelchair of the present invention, for the sake of clarity, only a portion of the components are shown schematically. The electric wheelchair of the present invention includes a seat portion 1, a body portion 2 serving as a seat bracket, a seat adjusting mechanism 3, a vehicle bottom portion 4, and a crawler running mechanism 5.

The seat portion 1 includes a seat and a support assembly 100 that is fixedly disposed on opposite sides of the seat bottom. Since the two support assemblies are identical in construction, only one of the support assemblies will be described herein.

Each support assembly 100 includes two longitudinal plates 101, 102 (or 108, 109) that are substantially perpendicular to the bottom of the seat, the top edges of which are fixed to the seat bottom at a distance from each other, and the outer longitudinal direction The bottom edge of the plate 102 is formed as a tooth 105 of a circular arc-shaped bottom edge of a concave concave arcuate edge (the bottom edge of the other outer longitudinal plate 109 is not shown), and the two longitudinal plates 101, 102 A space 103 is defined therebetween for accommodating and mounting a plurality of roller wheels 104, and both ends of the shaft of each roller wheel are respectively fixed to the two longitudinal plates.

The body portion 2 used as the seat frame includes a bottom frame (or a bottom plate) and two longitudinal side plates 201, 203 of the same configuration, and an upper portion of each of the longitudinal side plates 201, 203 is formed in a circular arc shape. In this embodiment, the arcuate top portion is partially clamped in the space 103 defined by the two longitudinal plates 101, 102; 108, 109 of the support of the seat, mounted in two longitudinal directions of each support member. A series of roller wheels 104 between the plates 101, 102; 108, 109 are slidably supported on the arcuate top edges of the longitudinal side plates 201, 203, and the arcuate top edges serve as the sliding of the roller wheels 104 path. A safety lock device 11 (only one shown) is provided on the outer side wall of each of the longitudinal side panels 201, 203, the safety lock device 11 cooperating with the toothed curved edge of the outer longitudinal plate of the seat support member This will be described in detail below.

The bottom frame of the body portion 2 is provided with a reduction motor 6 for operating the active extension track and a reduction motor 7 for operating the seat adjustment mechanism 3, see Fig. 2.

The gear set of the reduction motor 7 of the seat adjustment mechanism 3 comprises a large gear 73 which is fixedly connected to the seat portion 1 on the one hand by a connecting member 107 (see Fig. 1) and through a central hole through the other side. The rod member 14 is movably coupled to the two longitudinal side plates 201, 203 of the body portion 2, wherein the two ends of the rod member 14 are respectively fixed at the center of the arcuate portion of the longitudinal side plates 201, 203, the large gear 73 can be rotated about the rod 14.

The assembly for driving the crawler track is preferably disposed in the underbody portion 4 located below the body portion 2.

The crawler running mechanism 5 includes two sets of crawlers that are disposed below both sides of the underbody portion 4. Each set of crawlers includes a front crawler belt 51, a rear crawler belt 52, a movable extension crawler belt 53 disposed outside the front crawler belt 51, and a fixed upper ladder crawler belt 54 disposed outside the rear crawler belt 52. The front crawler belt 51 and the rear crawler belt 52 are coupled together by a connecting device 45 (for example, another crawler belt), and the pulley 506 fixing one end of the upper crawler belt 54 and the driving pulley at the rear end of the rear crawler belt 52 are fixedly connected side by side, and fixed up the ladder The other end of the crawler belt is offset from the rear crawler by a certain angle (see Fig. 2), and the pulley 503 at one end of the movable spread crawler 53 is fixedly coupled side by side with the pulley at the front end of the front crawler belt 51, and the free end of the movable extension crawler belt 53 can be wound around it. The fixed end pulley 503 is rotated 360° forward or backward. The two pulleys 503 of the fixed end of the movable extension track are connected by a shaft 9, wherein the shaft 9 is free to pass through the center hole of the two pulleys at the front end of the front crawler belt, and the shaft 9 is at its intermediate position by a connecting rod 91 The large gear 64 in the gear set of the reduction motor 6 for manipulating the active extension track is eccentrically connected.

Referring to Fig. 2, Fig. 3a, Fig. 3b and Fig. 10, the underbody portion 4 is composed of two front and rear portions 41, 42 arranged side by side, and the front portion 41 and the rear portion 42 are connected together by a connecting device 45 and at an angle The range is deflected relative to each other. In the present embodiment, the connecting device 45 is a crawler belt in which the crawler belt 45 passes the front end pulleys of the front crawler belt 51 and the front end pulleys of the rear crawler belt 52 to connect the front and rear portions 41, 42 together. Of course, the attachment means 45 is not limited to the track described above, but other means well known in the art, such as chains, etc., may also be employed.

Referring to Fig. 3a, a battery 8 for supplying power to each of the driving devices is disposed in the front portion 41, and two separate electric motors 421, 422 are disposed in the rear portion 42 for respectively driving one of the crawlers to advance the track set Or driving backwards and 360° horizontal steering to the left or right, the two electric motors 421, 422 being controlled by a lever 170 provided on the armrest of the seat. In this embodiment, the electric motors 421, 422 directly drive the pulley 506 at the rear end of the rear crawler belt 52, and the front crawler belt 51 is driven by the connecting device 45, and the pulley 503 at one end of the movable extension crawler belt 53 is fixed to the pulley at the front end of the front crawler belt 51. Connected together, the electric engine's power is also transmitted to the active extension track for operation.

In another embodiment, as shown in Figure 3b, a battery 8 for powering each drive unit is disposed in the rear portion 42, two separate electric motors 421, 422 are disposed in the front portion 41 and are used to drive the respective A set of tracks allows the track set to travel forward or backward and can make a 360° horizontal turn to the left or right. The two electric motors 421, 422 are controlled by a lever 170 disposed on the armrest of the seat. In this embodiment, the electric motors 421, 422 directly drive the connecting device 45 and the pulley 504 at the rear end of the front crawler belt 51, and drive the rear crawler belt 52 by the connecting device 45, and then drive the fixed ladder through the pulley 506 at the rear end of the rear crawler belt 52. Track 54.

The geared motor 6 for controlling the active extended crawler belt drives the movable extending crawler belt 53 to rotate via the shaft 9, so that the free end of the movable extending crawler belt 53 can be rotated to any angle with respect to its fixed end and stopped, which is passed through the reduction motor 6 The anti-reverse helical gear 62 in the gear set is realized. Referring to Fig. 4, the anti-reverse helical gear 62 is directly driven by a motor 60 of the reduction motor 6 through a shaft 61 and meshes with a gear 68 of the gear set of the reduction motor 6, and when the motor is energized, the anti-reverse helical gear 62 drives the gear. The rotation of 68 causes the movable extension crawler belt 53 to rotate, but when the motor is de-energized and stopped, the anti-backup helical gear 62 also stops rotating because the gear 68 cannot push the anti-backup helical gear 62, so that the movable extension crawler belt 53 is locked. In the desired location. The reduction motor 6 is controlled by a lever 160 provided on the armrest of the seat.

Also, an anti-reverse helical gear 72 is included in the gear set of the reduction motor 7 for operating the seat adjustment mechanism 3, see Fig. 2. When the motor of the reduction motor 7 is energized, the helical gear 72 drives the gear set to rotate, wherein the large gear 73 fixedly coupled to the seat drives the seat portion 1 along the upper side of the longitudinal side plates 201, 203 of the body portion 2. The sliding path moves forward or backward, and when the motor is stopped, the gear set locks the seat in place because the helical gear cannot be pushed.

Referring to Figure 5a, the seat adjustment mechanism 3 includes a balance sensing device 300 disposed at the bottom of the seat. In one embodiment, the balance sensing device 300 includes a weight 302 and a support member 304 for supporting the weight 302 and configured with a circuit system. The balance sensing device 300 can be suspended from the bottom of the seat by conventional methods. Above, in one embodiment, it is secured between the two inner longitudinal plates 101, 108 at the bottom of the seat and abuts one of the inner longitudinal plates 101 or 108.

The weight 302 is movably coupled to the support member 304 via two connecting rods 306, 308 disposed on opposite sides thereof, and the connection point 310 of each of the connecting rods 306, 308 and the support member 304 serves as a fulcrum such that the weight 302 acts as a pendulum The fulcrum can be swung forward (in the direction indicated by the arrow A in the figure, that is, the direction in which the passenger faces) or backward. In this embodiment, the two connecting rods 306, 308 are substantially "T" shaped, wherein one of the connecting rods 306 is provided with two opposite positive pole contacts c and e at the free end, and the other connecting rod 308 is free. Two opposite negative contacts d and f are provided on the end. The support member 304 is provided with the contacts a and g corresponding to the positive contacts c and e of the connecting rod 306 on the side of the same side of the connecting rod 306, and the supporting member 304 is provided on the side of the same side as the connecting rod 308. Contacts b and h corresponding to the negative contacts d and f of the connecting rod 308, wherein the two contacts a and h on the support 304 are connected by a wire L, and the other two contacts b and g are connected by a wire K . The contacts g and h are in turn electrically connected via a wire I, J to a geared motor 7 for actuating the seat adjustment mechanism, and the two connecting rods 306, 308 are respectively connected via an electric wire M, N and an automatic/manual mode switch 155. Electrical connection. The automatic/manual mode changeover switch 155 can be disposed on the armrest of the seat or in other places convenient for the passenger to use, and is electrically connected on the one hand to the battery 8 installed in the bottom portion of the vehicle, and on the other hand to the seat armrest. The control lever 150 of the reduction motor 7 for operating the seat adjustment mechanism is electrically connected. The operation mode of the seat adjustment mechanism 3 is switched by this automatic/manual mode changeover switch 155.

When the automatic mode is activated, the balance sensing device 300 at the bottom of the seat is powered on. In the case where the electric wheelchair is stepped up and down, the passenger or the wheelchair needs to face away from the stairs. In the case where the vehicle body is tilted while traveling (ie, the rear portion of the vehicle body is raised), the weight 302 of the balance sensing device 300 swings forward, so that the connecting rod The positive contact e of the contact 306 contacts the contact g of the bracket portion 304; at the same time, the negative contact f of the connecting rod 308 contacts the contact h of the bracket portion 304, thereby turning on the power, at which time the current is activated by the g and h. The geared motor 7 of the adjustment mechanism rotates the seat from the Y point toward the Z point to maintain a balance with the ground. On the contrary, when the electric wheelchair advances the ramp, the weight 302 will swing rearward, the positive contact c of the connecting rod 306 contacts the contact a of the bracket portion 304, and the contact h of the bracket portion 304 is connected by the electric wire L; The negative contact d of the connecting rod 308 contacts the contact b of the bracket portion 304, and then connects the contact g of the bracket portion 304 through the electric wire K. Finally, the current will start the reverse motor 7 through the positive and negative interchangeable contacts g and h. Operate so that the seat rotates from point Y towards point X to maintain balance with the ground. For the case of an electric wheelchair up and down the slope, the passenger or the wheelchair may choose to face or face the slope according to the specific situation. If the back slope is selected, the situation is similar to the above. If the slope is selected, the situation is opposite to the above.

Referring to Figures 5b to 5d, in order to make the movement of the seat portion safe and reliable, in one embodiment, an insulating plate 311 (see Fig. 5c) may be disposed between the two connecting rods 306 and 308 located above the support member 304, Both ends of the insulating plate may be respectively fixed to the two connecting rods 306 and 308. Further, two substantially "L"-shaped inductive blocking devices 312, 313 are disposed on the inner wall of one of the longitudinal side plates 201 of the body portion 2, and the two blocking devices are located on the moving path of the balance sensing device 300. To limit the range of movement of the seat portion. Since the moving path of the balance sensing device 300 is on an arc of a circle centered on the fixed end of the lever 14, in this embodiment, the forward or backward movement of the seat portion is limited to, for example, a range of 40 degrees. Inside.

For this purpose, the two blocking means 312, 313 are divided over the two terminals of the moving path of the balancing sensing device 300 such that they each are at an angle of 40 degrees to the balance sensing device 300 in the radial direction. It should be noted that for those of ordinary skill in the art, the angle can be set smaller or larger to accommodate steps of different tilt angles since most of the stairs have an angle of inclination of 20 to 35 degrees.

The lower portion of each of the blocking means 312, 313 is fixed to the inner wall of the longitudinal side panels 201, 203, the upper portion of which is spaced from the inner wall of the longitudinal side panels 201, 203 to allow the interior of the support assembly 100 of the seat portion The longitudinal plates 101, 108 are free to pass between the blocking means and the inner walls of the longitudinal side panels 201, 203. A rod 314, 315 is also disposed on each of the two blocking means 312, 313 facing each other. The rods 314, 315 extend generally perpendicularly from the upper portion of the body of the blocking means 312, 313, and at one end thereof remote from the body is provided an inductive button 316 for use as an alarm switch, the inductive button 316 being configured to When pressed, it can be elastically retracted into the inside of the rod and electrically connected to an alarm (not shown) provided on the wheelchair. The alarm can be placed at any suitable location on the wheelchair body. When the sensing member 316 is in the released state, the axial length of the rods 314, 315 is greater than the distance between the body of the rod and the insulating plate 311 of the balance sensing device 300 when the body of the rod is in contact with the balance sensing device 300. The sensing button 316 is brought into contact with the insulating plate 311 and can be pressed into the inside of the rod-shaped sensing member to turn on the alarm.

In the case where the wheelchair has a slope with a large up and down slope, taking the upward facing slope as an example, in this embodiment, the balance sensing device 300 is disposed inside the support member 100 on the right side of the seat portion (ie, the right hand side of the passenger). Between the longitudinal plate 108 and the seat pan, see Figure 5b. When the vehicle body is tilted due to the upward slope (ie, the front portion of the vehicle body is raised), the weight 302 swings rearward due to gravity, causing the contacts a, b and c, d of the balance sensing device 300 to contact and start the geared motor 7 in the reverse direction. Rotate so that the seat moves from point Y to point X, see Figure 5a. When the vehicle body is tilted up to 40 degrees, the balance sensing device 300 moves forward with the seat to contact with the blocking device 313, as shown in Figures 5c and 5d, at which time the sensing button 316 of the rod 315 of the balancing sensing device 300 is balanced. The alarm plate 311 is compressed into the inside of the rod 315 to turn on and activate the alarm. The alarm sounds an alarm to remind the passenger that the inclination of the wheelchair body has reached the limit and does not continue. On the other hand, since the rod 315 of the blocking device 313 is against the insulating plate 311 of the balance sensing device 300, the weight connecting rods 306, 308 of the balance sensing device 300 are held in the initial position, that is, the connecting rods 306, 308 are opposite. When the support member 304 is vertically and undeflected, the contacts are unable to touch the corresponding contacts on the support member 304, so that the seat cannot slide forward or backward. In this case, when the wheelchair is retracted to the ground, the seat is always in equilibrium by the adjustment of the balance sensing device 300 until it is safely returned to the ground. When the manual mode is activated, the current of the balance sensing device 300 is cut off by the switch, and is controlled by the control lever 150 of the reduction motor 7. In this mode, the passenger can freely rotate the seat from point Y to point Z or from point Y to point X through the lever 150, thereby increasing flexibility and making it easier for the passenger to get on and off the wheelchair. For example, as shown in Figures 6a and 6b, the seat can be adjusted to the rear, and the passenger can easily wash the head or transfer from the rear to the seat or bed. When the passenger adjusts the seat to the front, the passenger can transfer to the car, the seat or the bed on his own, even without the help of others.

The seat adjustment mechanism 3 further includes a safety lock that is disposed on the outer side wall of each of the longitudinal side panels 201, 203 of the body portion 2 and that is engageable with the teeth 105 of the arcuate bottom edge of the outer longitudinal plates 102, 109 of the seat portion. Device 11. The safety lock device can be a two-wing safety lock device 11, see Figs. 7a and 7b, which includes a housing 110, a pair of latching members 111 fixed to the housing wall by springs 115, 116, 112, two pinions 113, 114, one of which is configured as a small motor. Each of the locking members has a small toothed edge and a large toothed edge, and the two small gears 113, 114 respectively engage with the small toothed edges of one of the locking members, and the large toothed edges of the two locking members are locked in the safety lock device In the tight state, the teeth 105 of the arcuate bottom edge of the outer longitudinal plates 102, 109 are engaged. When in the unlocked state, the large toothed edge of the locking member is moved by the pinion gear away from the arcuate bottom edge of the longitudinal plates 102, 109 and locked by the respective springs 115, 116 in their initial positions. . When such a safety lock is used, the power of the small motor 114 is directly connected to the motor of the reduction motor 7 of the seat adjustment mechanism 3, and when the wheelchair is smoothly traveling, the swing of the weight 302 of the balance sensing device 300 is insufficient to be turned on. The power supply of the balance sensing device, the motor of the reduction motor 7 and the small motor 114 of the safety lock are not energized, so that the left and right locking members of the safety lock lock the wheelchair due to the spring force. When the wheelchair is tilted, the balance sensing device causes the motor of the reduction motor 7 and the small motor 114 of the safety lock to be simultaneously activated, and the small motor rotates clockwise to rotate the locking member engaged therewith in the counterclockwise direction and away from the longitudinal plate 102, The arc-shaped bottom edge of the teeth 105 of 109, at the same time, the small motor will drive the other pinion to rotate counterclockwise, so that the other locking member also leaves the arc-shaped bottom edge of the longitudinal plates 102, 109, thereby The sliding part of the mobile seat can slide smoothly.

Because of the two locking members, the locking member can tightly lock the wheelchair without tipping over, regardless of whether the wheelchair is tilted to either side, such as the manual mode shown in Figures 6a and 6b.

The above-described two-wing safety lock device is only a preferred embodiment of the present invention, and other devices that can realize such a lock function can be employed by those skilled in the art.

In controlling the active extension track, one of the above-described two-wing safety lock devices 12 is preferably provided in the gear set of the reduction motor 6 that controls the active extension track, as shown in FIG. Thus, when the motor of the reduction motor 6 is energized, the safety lock device 12 is automatically energized to unlock, allowing the gear train of the reduction motor 6 to drive the active extension track 53 to rotate to the desired position. When the motor is stopped, the safety lock locks the gear set so that the active extension track 53 cannot rotate and stays in the desired position.

Since the electric wheelchair of the present invention employs an anti-reverse helical gear and a double-wing safety lock device, the movable seat and the active extended crawler of the wheelchair can be maintained in stability under any circumstances, thereby achieving passenger safety.

In addition, since the electric wheelchair of the present invention adopts an active extension track that can be rotated by 360 degrees, the movable extension track can be rotated forward when necessary, until the front end of the extended track touches the ground, thereby supporting the wheelchair, and at the same time, The seat adjustment mechanism of the present invention automatically adjusts the movable seat to a vertical balance so that the passenger can obtain a field of view as a healthy person stands. When the electric wheelchair encounters an obstacle on the ground, the activity extension track can be rotated backward until the front end of the extended track touches the ground to raise the front end of the wheelchair to cross the obstacle, thereby enabling the wheelchair to pass smoothly. .

When using the multi-layered step on the electric wheelchair of the present invention, the passenger first has to turn the wheelchair back to the ladder, and the crawler travel control lever 170 is controlled by one hand, so that the wheelchair is slowly driven backward, when the fixed upper ladder hits the ladder, The rear crawler is used to climb the ladder, while the other hand is used to control the active extension track control lever 160 to cause the extended track to be turned forward from both sides to be in line with the front and rear tracks. The body tilts when the wheelchair is climbing up the ladder. At this time, the seat adjustment mechanism functions to keep the passengers in vertical balance. When the wheelchair reaches the top of the ladder, the rear part of the body will land first, while the front track is still on the ladder. At this point, the rear track is deflected at an angle relative to the front track, as shown in Figure 10, allowing the rear track to land smoothly, avoiding The impact of the sudden fall of the body. When the wheelchair reaches the flat ground completely, the front and rear crawlers become the same line. The control lever 160 can be used to extend the extended track backwards and lay flat on both sides of the vehicle body to reduce the length of the vehicle body.

During the next multi-step ladder, the passenger carefully drives the wheelchair to the edge of the step, using the active extension track control lever 160 to control the extension track to flip forward from both sides until the front end touches the ladder, and then slowly drives the wheelchair forward, which can be controlled by the extended track The body remains steady. The seat adjustment mechanism allows the passenger to maintain a vertical balance as the body leans down the stairs. When the wheelchair reaches the ground, the front end of the extended track will take the lead, and the passenger can control the extended track to slowly retract backwards to allow the wheelchair to land smoothly.

When the passenger is in a wheelchair, the power of the balance sensing device is first turned off, so that the seat adjustment is switched from the automatic mode to the manual mode, and the control lever 150 is used to control the inclination angle of the seat, when the angle is appropriate, the anti-reverse gear combination and safety The lock locks the seat to the desired angular position of the passenger so that the passenger can safely transfer from the bed, the seat, the toilet, etc. to the wheelchair, and vice versa.

The various levers and switch devices described above can be placed on one or both sides of the wheelchair armrest, or other locations that are accessible to passengers.

While the advantages and embodiments of the present invention have been described herein, it will be understood by those skilled in the art The described implementation details may be replaced with any other equivalents, or modifications or variations may be made without departing from the scope of the invention.

1. . . Seat part

2. . . Body part

3. . . Seat adjustment mechanism

4. . . Bottom part

5. . . Track walking mechanism

6, 7. . . Geared motor

8. . . Battery

9. . . Shaft

11. . . Safety lock device

14. . . Lever

41. . . The front portion

42. . . Rear part

45. . . Connecting device

51. . . Front track

52. . . Rear track

53. . . Active extension track

54. . . Fixed ladder track

60. . . motor

61. . . axis

62, 72. . . Anti-reverse spiral gear

64, 73. . . big gear

68. . . gear

91. . . Connecting rod

100. . . Support assembly

101, 102, 108, 109. . . Vertical plate

103. . . space

104. . . Roller wheel

105. . . Arc-shaped bottom edge tooth

107. . . Connector

110. . . case

111, 112. . . Locking piece

113. . . gear

114. . . Pinion, small motor

115, 116. . . spring

150, 160, 170. . . Controller

155. . . Automatic/manual mode switch

201, 203. . . Longitudinal side panel

300. . . Balance sensing device

302. . . Heavy object

304. . . Support

306, 308. . . Connecting rod

310. . . Junction

311. . . Insulation board

312, 313. . . Blocking device

314, 315. . . Rod

316. . . Induction button

421, 422. . . Electric engine

503, 506. . . pulley

1 is a perspective view of one embodiment of an electric wheelchair in accordance with the present invention, showing only a portion of the components, wherein the active extension track is in a stowed position alongside the front track.

2 is a schematic partial cross-sectional view of the electric wheelchair of FIG. 1 with the active extension track in a forwardly turned position to a certain angle.

Figure 3a is a top plan view of some of the drive components of the body portion and the underbody portion of the embodiment of the electric wheelchair of Figure 1 with the electric engine disposed in the rear portion of the underbody portion.

Figure 3b is a top plan view of a portion of the body portion and the underbody portion of the vehicle body portion of the electric wheelchair of Figure 1 with the electric motor disposed in the front portion of the underbody portion.

Figure 4 is a schematic illustration of an anti-reverse gear combination.

Fig. 5a is a schematic view showing the operation of the seat adjusting mechanism of the electric wheelchair according to the present invention.

Fig. 5b is a schematic view showing the balance sensing device of the seat adjusting mechanism according to the present invention in an initial position, showing only the structure of the longitudinal side plate of the right side of the wheelchair and the longitudinal plate of the seat support shown in Fig. 2.

Fig. 5c is a schematic view showing the operation of the balance sensing device shown in Fig. 5b when it reaches the end position of one end thereof.

Fig. 5d is a schematic view of the insulating plate of the balance sensing device of Fig. 5b in contact with the sensing button of the rod of the blocking device at the end position of the end.

Figures 6a and 6b are schematic illustrations of two adjustment modes of the seat portion.

Figure 7a is a schematic view showing the structure of the two-wing safety lock in the locked state.

Figure 7b is a schematic structural view of the two-wing safety lock in an unlocked state.

Figure 8 is a view showing the position of the movable crawler in the process of the electric wheelchair in the upper or lower stairs of the present invention.

Figure 9 is a schematic illustration of the seat of the electric wheelchair in accordance with the present invention in an elevated state.

Figure 10 is a schematic view showing the electric wheelchair of the present invention as it climbs to the top of the step, and the front and rear portions of the underbody portion are relatively deflected at an angle to cause the rear portion to land first.

1. . . Seat part

2. . . Body part

5. . . Track walking mechanism

9. . . Shaft

11. . . Safety lock device

14. . . Lever

73. . . big gear

91. . . Connecting rod

100. . . Support assembly

101, 102, 108, 109. . . Vertical plate

103. . . space

104. . . Roller wheel

105. . . Arc-shaped bottom edge tooth

107. . . Connector

150, 160, 170. . . Controller

201, 203. . . Longitudinal side panel

Claims (10)

An electric wheelchair comprising a mobile seat portion, a body portion serving as a seat bracket, a seat adjustment mechanism disposed under the seat for maintaining the balance of the seat portion, and a vehicle bottom located below the body portion And a crawler running mechanism comprising two sets of crawlers respectively disposed below the two sides of the underbody portion, each set of crawlers comprising a front crawler belt and a rear crawler belt, wherein the vehicle bottom portion is The front and rear two parts are formed, and the front and rear two parts are movably connected by a connecting device and can be mutually deflected relative to each other within a certain angle range; the crawler running mechanism further comprises an active extending track respectively disposed outside each of the front crawlers a pulley extending at one end of the movable extension crawler is fixedly coupled to a pulley at a front end of the front crawler belt, and the free end of the movable extension crawler belt can be rotated forward or reverse relative to the fixed end thereof within a range of 360 degrees by the control lever, and respectively disposed at a fixed upper ladder track on the outer side of each of the rear crawler belts, the pulleys at one end of the fixed upper crawler track and the rear end of the rear crawler belt Fixedly connected, and the other end is fixed on the rear ladder crawler track relative offset angle. The electric wheelchair of claim 1, wherein the seat adjustment mechanism and the active extension track are each driven by a separate reduction motor. The electric wheelchair of claim 1, wherein each of the sets of crawler belts is driven by a separate electric motor. An electric wheelchair as claimed in claim 1, wherein the shifting A set of roller wheels are respectively disposed at the bottoms on both sides of the movable seat portion, the seat portions are supported on the body portion by the roller wheels, and each group of the roller wheels is controlled by a control device The sliding path formed on the body portion moves to drive the seat portion to move. The electric wheelchair according to claim 4, wherein the control device for controlling the roller wheel includes a control lever electrically connected to the reduction motor of the seat adjustment mechanism and is disposed on the body portion Safety lock device. The electric wheelchair according to claim 5, wherein the safety lock device is a double-wing safety lock device, comprising a housing, and a pair of spring-loaded locking members fixed on the wall of the housing, two a pinion gear, wherein one of the pinion gears is configured as a small motor, each of the latching members has a small toothed edge and a large toothed edge, and the two pinion gears respectively mesh with the small toothed edge of one of the locking members And the large tooth edges of the two locking members engage with the teeth of the arc-shaped bottom edge of the longitudinal plate of the seat portion when the safety lock device is in the locked state, when in the unlocked state, The large toothed edge of the locking member is moved away from the teeth of the arcuate bottom edge of the longitudinal plate by the pinion gear and is locked in its initial position by the respective springs. The electric wheelchair according to claim 2, wherein the reduction motor for driving the seat adjustment mechanism includes an anti-reverse helical gear. An electric wheelchair according to claim 1, wherein the seat The chair adjustment mechanism includes a balance sensing device including a weight for use as a pendulum and a support for supporting and allowing the weight to swing, the support member being provided with circuitry, the circuitry being The geared motor for the seat adjustment mechanism is electrically connected and electrically connected to the storage battery. The electric wheelchair according to claim 2, wherein the reduction motor for driving the active extension crawler comprises an anti-reverse helical gear and a double-wing safety lock device. The electric wheelchair according to claim 1, wherein the seat portion is fixedly coupled to a large gear in the reduction motor for driving the seat adjustment mechanism via a connecting member.